CVE-2020-6823

critical

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

9.5

Description

A malicious extension could have called <code>browser.identity.launchWebAuthFlow</code>, controlling the redirect_uri, and through the Promise returned, obtain the Auth code and gain access to the user's account at the service provider. This vulnerability affects Firefox < 75.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-6823

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-6823.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202004-8

OS impact

OS	Version	Status	Fixed in
arch		fixed	`75.0-1`
sles		affected
debian	sid	fixed	`75.0-1`

References

https://security.archlinux.org/ASA-202004-8
https://www.suse.com/security/cve/CVE-2020-6823.html
https://security-tracker.debian.org/tracker/CVE-2020-6823

Verify integrity in audit chain (admin only). AS-IS.